| Both social development and technological progress need to be based on abundant energy. However, as continuous social development and economic progress, the worldwide energy consumption is also escalating. Among others,the development of higher learning in all nations is faced with the problem of considerable energy consumption just as well. However, a part of such energy consumption may be saved with advanced science and technology. This paper has examined in depth, and designed an efficient and scientific communications system for campus monitoring system of energy consumption.Through the analysis on monitoring systems adopted in the past, we can find that information acquisition is really hard to be deployed to system bottom. This paper has utilized wireless and wire communication systems adjoined for information acquisition and transmission to solve this problem.After comparison between common wireless/wire communication methods, we have finally determined to use the wireless transmission and Ethernet communication plan based on RF technology, which is featured with low cost,stable and reliable transmission, high transmission rate, preferable sharing capacity and advantageous transmission distance unparalleled for other methods. This paper has designed sensing nodes, integrated wireless communication and sensors, utilized WSN technology, and deployed it to the bottom of overall system to complete information collection and transmission.Sensing nodes transmit information to upper computer via gateway node for data storage and treatment.The overall designed system may be divided into two parts principally as sensing node subsystem and gateway node subsystem respectively. Internal central control chips of both subsystems adopt STM32F103 series single-chips, in which the maximum frequency capable in normal operation exceeds 70 hz, and the data processing speed application of built-in high-speedmemory STM32 can reflect data transmission speed in network communications. In design of sensing node system, n RF24L01 wireless data transmission module is chosen to transmit sensor information, while OLED is provided to display the transmitted information value and transmission status.In addition, gateway node is generally used for Ethernet interface design,among others, choosing ENC28J60 Ethernet controller as physical interface,special n RF24L01 wireless transmission module equipped in gateway node to realize communication purpose of connection between two nodes. 2.8"TFTLCD screen is chosen for display design in this paper to display the received data value and transmit status information.The difference existing in system software design in terms of transmission mode can also be distinguished in two designs: wireless and wire transmission. Among others, wireless transmission is allocated with n RF24L01 principally, and information is transmitted through SPI interface in STM32.Wire communication system also chooses SPI interface for setting of ENC28J60, and transplants u IP protocol stack. The gateway node deposits data received in buffer area, which is converted into data package by STM32 and capable to be transmitted in Ethernet, and finally transmitted to Ethernet via network card to achieve interconnection of different internet. When the upper computer is going to transmit control command, the flow is reversed.Up to now, two nodes in communications system designed by this paper have been produced, and achieved the purpose ready for use. Through the test,this design is able to transmit information. Through the distance test conducted in campus offices and classrooms, the design fulfills the user need and could be applied in offices and conference rooms in buildings. The accuracy test also showed positive result. |
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